The Maryland tax ID which is used on W2 box 15 is an ID your business as an employee received when registered with state taxing authorities.

The filings process is to file a “Combined Central Registration” with the Maryland Comptroller’s Office.

This form from the Comptroller’s Office will ask the filer to list both the FEIN number and this Department’s internal entity filing number. This Central Registration Form of the Comptroller’s Office deals with Maryland taxes owed, including employee withholding taxes.

The Comptroller’s Office may be reached at _410_767_1313_ from the Baltimore area,